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류화성 ( Ryu Hwa-sung ),신상헌 ( Shin Sang-heon ),송성용 ( Song Sung-yong ),김득모 ( Kim Deuck-mo ) 한국건축시공학회 2019 한국건축시공학회 학술발표대회 논문집 Vol.19 No.1
In modern times, due to the centralized urban structure, the interval between buildings is narrow and the increase of the heat island phenomenon due to the accumulation of the structure is becoming a social problem. In order to solve these problems, various materials for reducing the surface temperature of buildings are under study. Particularly, in the case of a wall part which is a part directly affected by the outside air of the building, it is a main structural part for determining the room temperature. The purpose of this study was to develop a material that can improve the thermal environment performance of the building by evaluating the temperature control performance of the exterior finishing material using the heat reflecting material as a method for controlling the temperature of the outer wall finishing material.
유기계 방청제를 혼입한 표면피복재의 유해이온 침투저항에 관한 실험적 연구
류화성 ( Hwa-sung Ryu ),신상헌 ( Sang-heon Shin ),이한승 ( Han-seung Lee ) 한국건축시공학회 2017 한국건축시공학회지 Vol.17 No.2
일반적으로 크리트 구조물의 열화를 발생하는 가장 중요한 원인은 탄산화와 염소이온이다. 대체적으로 많은 콘크리트 구조물에서 탄산화와 염소이온으로 인하여 철근이 부식되며 이에 대한 많은 연구가 이루어지고 있다. 특히, 최근에는 보수용으로서 콘크리트 보호용 표면피복재에 방청제를 함침시켜, 염화물을 포함하고 있는 콘크리트 내 철근의 부식을 억제하는 공법도 개발되어지고 있다. 이에, 본 연구에서는 기존 보수재료 보다 부식 억제가 우수하고 열화원인인CO2 와 Cl-를 고정하는 유기계방청제를 혼입한 표면피복재의 특성 평가를 위해 촉진탄산화 및 시차 열 중량분석(TG-DTA), CASS시험를 실시하여 특성을 실험적으로 평가하였다. 실험 결과, TG-DTA 분석과 촉진탄산화를 통하여 유기계방청제 혼입으로 시멘트 콘크리트에 CO2가 아민유도체와 직접적으로 반응하여 탈 양성자화 되면서 산성상태의 물질을 생성하여 안정화된 상태, 즉 CO2가 고정화되어 탄산화 억제효과가 있음을 확인 하였다. 또한, CASS실험에서도, Cl- 고정 특성이 있는 유기계 방청제가 혼입된 표면피복재를 도포한 시험체의 경우, 28일째까지도 적청 발생이 관찰되지 않았으며 염화물에 의한 철근 부식을 방지하는데 우수한 성능으로 가지고 있음을 확인하였다. In general, carbonation and chlorine ions are the most harmful causes of deterioration of concrete structures. Recently, a method has been developed to control the corrosion of rebar in concrete containing chloride by impregnating a Surface coating material with a inhibitor. In this study, accelerated carbonation and differential thermogravimetric analysis (TG-DTA) and CASS tests were carried out to evaluate the characteristics of Surface coatings containing Organic Corrosion inhibitors which are excellent in corrosion inhibition and fix degradation causes CO<sub>2</sub> and Cl<sup>-</sup>. As a result of the experiment, TG-DTA analysis and accelerated carbonation showed that CO<sub>2</sub> was directly reacted with amine derivative in concrete by the incorporation of Organic Corrosion inhibitor. In other words, CO<sub>2</sub> was immobilized and carbonation inhibition effect was confirmed. In addition, in the CASS test, the specimen coated with the Surface coating material containing the Organic Corrosion inhibitor with Cl<sup>-</sup> fixing property showed no corrosion until the 28th day and had excellent performance in preventing corrosion of a rebar by the chloride ion.
류화성 ( Ryu Hwa-sung ),신상헌 ( Shin Sang-heon ),김득모 ( Kim Deuck-mo ),송성용 ( Song Sung-yong ) 한국건축시공학회 2020 한국건축시공학회지 Vol.20 No.1
외단열 마감 공법에서 사용되는 얇은 바름재는 아크릴 에멀젼을 주 소재로 한 마감재이다. 본 연구에서는 실란 개질아크릴 에멀젼과 실리카 분산아크릴 에멀젼을 치환하였을 때 특성을 평가하였다. 실험결과, 실란 개질 아크릴 에멀젼은 인장강도 개선에는 큰 효과는 없었으나 부착강도, 물흡수계수, 온냉반복저항성의 성능 개선에 효과적인 것으로 나타났다. 실리카 분산 아크릴 에멀젼은 인장강도 개선에 효과적이며, 10%의 치환율에서는 부착강도, 물흡수계수, 온냉반복저항성의 성능 개선에 효과적인 것으로 나타났다. 이를 통해 아크릴 에멀젼의 성능을 향상할 수 있는 복합 에멀젼을 제조할 수 있는 것으로 판단되었다. The thin coating material used in the outer insulation finishing method is a finishing material mainly based on acrylic emulsion. In this study, the properties of silane modified acrylic emulsion and silica dispersed acrylic emulsion were evaluated. Experimental results showed that the silane modified acrylic emulsion had no significant effect on improving tensile strength, but was effective in improving the performance of adhesion strength, water absorption coefficient, and hot and cold repeat resistance. Silica-dispersed acrylic emulsions were effective in improving tensile strength, and at 10% substitution rate, they were effective in improving the performance of adhesion strength, water absorption coefficient and hot / cold resistance. Through this, it was judged that a composite emulsion capable of improving the performance of the acrylic emulsion could be prepared.
건축물 외단열재의 열전달평가를 통한 화재 억제 방안 연구
류화성 ( Ryu Hwa Sung ),신상헌 ( Shin Sang Hun ),송성용 ( Song Sung Young ),김득모 ( Kim Deuck Mo ) 한국건축시공학회 2018 한국건축시공학회 학술발표대회 논문집 Vol.18 No.1
Improvement of insulation performance of buildings is a major part. Adiabatic method The adiabatic method minimizes the heat loss of the building. External insulation uses insulation to prevent fire. Ambient air hazards are less prone to fire. When a fire occurs, a phenolic pattern is formed and bond strength with the wall increases. EPS insulation and phenol foam were used to compare external heat transfer and external heat transfer. The heat transfer properties of phenolic foam and styrofoam were evaluated as follows. In the mortar and styrofoam structure, the problem of styrofoam reaching the burning point occurred before the collapse of the mortar, and the phenol foam had a problem in that when the direct fire was continued on the phenol foam, , The characteristics of continuous infiltration appeared. In the case of mortar and phenol foam + styrofoam, the heat penetrated into the interior due to the shrinkage due to the shrinkage of the carbon screen on the phenol foam. However, when reinforced with glass mesh on the outer surface, And to reduce infiltration.
동결융해 이후의 FRP Hybrid Bar의 부식 저항성
류화성(Hwa-Sung Ryu),박기태(Ki-Tae Park),윤용식(Yong-Sik Yoon),권성준(Seung-Jun Kwon) 한국건설순환자원학회 2018 한국건설순환자원학회 논문집 Vol.6 No.1
콘크리트 구조물은 다양한 환경에 노출되며, 부식환경인 해안가에서는 매립 보강재의 부식저항성 및 동결융해 저항성이 함께 평가되어야 한다. 최근 개발된 FRP Hybrid Bar는 내부에 강재가 있으며 유리섬유와 에폭시가 코팅된 보강재인데, 기존 FRP Bar보다 탄성계수가 높은 장점이 있다. 본 연구에서는 FRP Hybrid Bar에 대하여 동결융해 300 cycle 시험을 수행한 뒤, 내부식특성과 중량결손율, 및 부착특성을 평가하였다. 300 cycle 이후 2번 에폭시를 코팅한 경우에 규사의 손실이 가장 적었으며, 외관의 결함이 관측되지 않았다. 부착강도는 규사코팅에 따른 조도의 증가로 FRP Hybrid Bar의 경우 일반철근의 120 % 수준을 나타내었다. 또한 일반철근을 가진 시편의 부착력은 부식시간 3일에서는 0.86 ~ 0.89 배, 5일에서는 0.35 ~ 0.38 배로 크게 감소하였으나, 동결융해 전후의 FRP Hybrid Bar를 가진 콘크리트 공시체는 부착강도의 감소가 발생하지 않았다. RC(Reinforced Concrete) structures are exposed to various exterior conditions, and the performances of both chloride resistance and freezing/thawing action are evaluated for those exposed to corrosive environment-sea shore. Recently developed FRP Hybrid Bars which is coated with glass fiber and epoxy with core steel has an engineering advantage of higher Elasticity than FRP rod. In this work, corrosion resistance, weight loss, and bond strength are evaluated for the FRP Hybrid Bar tested through freezing/thawing action for 300cycles. The double coated FRP Hybrid Bar shows the least weight loss without defection due to freezing/thawing action. Bond strength in FRP Hybrid Bar increases to 120% of normal steel through torturity effect with Si-coating. Bond strength in normal steel shows 0.86~0.89times in 3-day corrosion acceleration and 0.35~0.38times in 5-day corrosion acceleration, however, that in FRP Hybrid Bar shows little changes in bond strength before and after freezing/thawing action.
복합 스터드 패널 충전용 고성능 BIO 경량기포모르터 개발에 관한 연구
류화성(Ryu Hwa-Sung),우영제(Woo Young-Je),이한승(Lee Han-Seung),배규웅(Bae Kyu-Woong) 대한건축학회 2007 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.27 No.1
Light-Weight Foamed Mortar has been used as floor insulations and grouting materials. But most of them may have side effects such as a bad smell and foaming agent stability by using vegetability foaming agent, or animal nature foaming agent. Recent, therefore research and development about mineral foamed with safety are going on nowadays. The aim of this study is to develop High Performance Bio Light-Weight Founded Mortar that may replace glass fiber and asbestos fiber as a filler for Hybrid Stud Panel. This paper will not only develop Bio Light-Weight foamed mortar with infrared radiation and antibiosis but also achieve compressive strength more than 5㎫ based on specific gravity. Also, after improving fire protecting performance then estimate whether it can be used as a insulating materials or not.